Stearic acid, monoester with propane-1,2-diol

Bioaccumulation: aquatic / sediment

Link to relevant study record(s)

Reference

Endpoint:

bioaccumulation in aquatic species: fish

Type of information:

other: Weight of evidence

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

No data are available for "Stearic acid, monoester with propane-1,2-diol". The bioaccumulation of this substance is therefore assessed in a weight of evidence analysis on the basis of calculation
of the BCF of the components in the substance.

As the substance is composed of different components and as expert group assessments
of the components in the substances are considered the most valid method for the
assessment, an overall weight of evidence approach is used for the assessment.

Qualifier:

no guideline followed

Principles of method if other than guideline:

The bioaccumulation of this substance is derived on the basis of a weight of evidence analysis due to calculations of the BCF of the components in the substance.

GLP compliance:

no

Key result

Temp.:

ca. 25 °C

pH:

7

Type:

BCF

Value:

> 200 dimensionless

Basis:

whole body d.w.

Calculation basis:

steady state

Validity criteria fulfilled:

not applicable

Conclusions:

Based on a weight-of-evidence approach it is concluded that the compound “Stearic acid, monoester with propane-1,2-diol” has a BCF below 200.

Executive summary:

Data on this endpoint are not available for “Stearic acid, monoester with propane-1,2-diol”. The bioaccumulation of this substance is therefore assessed in the present weight of evidence analysis on the basis of calculation
of the BCF of the components in the substance. As the substance is composed of different components and as expert group assessments of the components in the substances are considered the most valid method for the assessment, an overall weight of evidence approach is used for the assessment.

 

Within this group is the group of polyglycerol fatty acid esters, which are commonly used “Stearic acid, monoester with propane-1,2-diol” is an UVCB substance. BCFBAF calculations on all identified constituents in the UVCB substance resulted in a BCF between 3 and 515 with a concentration averaged BCF well below 500. Based on a weight-of-evidence approach it is concluded that the compound “Stearic acid, monoester with propane-1,2-diol” has a BCF below 200.

Description of key information

Test data on bioaccumulation (BCF) is not available for “Stearic acid, monoester with propane-1,2-diol” (PGMS). The bioaccumulation of this substance is therefore assessed based on a weight of evidence analysis of the BCF of the components in the substance and their major metabolites.

The two main constituents of the UVCB substance are both monoester of propane-diol with octadecanoic acid (45-98%) and the monoester of propane-diol with palmitic acid (2-50%). Thus, the UVCB substance belongs to the group of fatty acid esters and has a very similar structure to the well-known monoglycerides – the only exception being the lack of a OH-group on the C₃-carbon in the propylene glycol. The group of monoglycerides is well recognised as having a low potential for bioaccumulation due to their readily metabolism primarily into glycerol and the fatty acid – the latter readily being metabolised via the common mechanism of β-oxidation. The UVCB substance is assessed to be metabolised in the same manner as the monoglycerides via the formation of the fatty acid and the propylene glycol.

Therefore, based on a weight of evidence approach, the substance is concluded to have a low potential for bioaccumulation. The BCF values of the various components were calculated using BCFBAF v3.01 (EPI Suite v4.11), and it was concluded that the compound “Stearic acid, monoester with propane-1,2-diol” has a BCF below 200.

This weight-of-evidence-based conclusion on the low potential for bioaccumulation as for the monoglycerides is justified by their common functional groups, metabolism pathway and their common precursors/breakdown products. Taken together, the information from these independent sources is consistent and provides sufficient weight of evidence for an endpoint conclusion in accordance with Annex XI, 1.2, of Regulation (EC) No 1907/2006.

Key value for chemical safety assessment

BCF (aquatic species):

200 dimensionless